$backColor :#1a94bc;

@mixin spanStyle{
    cursor: pointer;
    position: relative;
    &::after {
      content: "";
      display: block;
      width: 1.4rem;
      height: 1.4rem;
      position: absolute;
      top: 5px;
      left: 2.4rem;
      z-index: -1;
      transform: rotate(45deg);
    }

    &:hover {
      width: 5.4rem;
      &::after {
        left: 4.7rem;
      }
    }
}